<?php

class LtCacheAdapterPhps implements LtCacheAdapter
{
    public function connect($hostConf)
    {
        $fileStore = new LtStoreFile;
        if (isset($hostConf['host']) && is_string($hostConf['host'])) {
            $fileStore->cacheFileRoot = $hostConf['host'];
            $fileStore->prefix = 'Ltcache-phps-';
            $fileStore->init();
            return $fileStore;
        } else {
            trigger_error("Must set [host]");
            return false;
        }
    }

    public function add($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        return $connectionResource->add($this->getRealKey($tableName, $key), $this->valueToString($value), $ttl);
    }

    public function del($key, $tableName, $connectionResource)
    {
        return $connectionResource->del($this->getRealKey($tableName, $key));
    }

    public function get($key, $tableName, $connectionResource)
    {
        return $this->stringToValue($connectionResource->get($this->getRealKey($tableName, $key)));
    }

    public function update($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        return $connectionResource->update($this->getRealKey($tableName, $key), $this->valueToString($value), $ttl);
    }

    protected function getRealKey($tableName, $key)
    {
        return $tableName . "-" . $key;
    }

    protected function valueToString($value)
    {
        return serialize($value);
    }

    protected function stringToValue($str)
    {
        return unserialize($str);
    }
}
